--- Comment #3 from Roland Haberkorn <> ---
Ok, I digged somewhat deeper. I've found a second difference between my two
sources. The one is the original data, the other one is a diffential rsync
backup with hard links.
I then built a testcase with about 50 million dummy files with something like

for i in {1..50}
mkdir $i
#cd $i
for j in {1..1000}
mkdir $i/$j
#cd $j
for k in {1..1000}
touch $i/$j/$k

Rsyncing this testfolder work fine from and to any of the tested file systems
(ext4 64Bit, XFS, btrfs). This is true for with and without the Option -H and
as long as in the source file system there is no hard linked copy of the source
In the moment when there is at least one hard linked copy the option -H breaks
the run:

roland@msspc25:~$ stat /mnt/rsynctestsource/1/1/1
  File: /mnt/rsynctestsource/1/1/1
  Size: 0               Blocks: 0          IO Block: 4096   regular empty file
Device: 811h/2065d      Inode: 153991349   Links: 2
Access: (0644/-rw-r--r--)  Uid: ( 2001/  roland)   Gid: (  100/   users)
Access: 2017-05-09 10:54:10.341300841 +0200
Modify: 2017-05-08 09:33:51.535967423 +0200
Change: 2017-05-26 16:21:57.610628573 +0200
 Birth: -
roland@msspc25:~$ rsync -rlptgoDxAn --info=name,progress2  --delete
--link-dest=/mnt2/link3/ /mnt/rsynctestsource/ /mnt2/link1/.
              0 100%    0.00kB/s    0:00:00 (xfr#0, to-chk=0/49049050)   
roland@msspc25:~$ rsync -rlptgoDxHAn --info=name,progress2  --delete
--link-dest=/mnt2/link3/ /mnt/rsynctestsource/ /mnt2/link1/.
              0 100%    0.00kB/s    0:00:00 (xfr#0, ir-chk=1000/25191050)
ERROR: out of memory in hashtable_node [sender]
rsync error: error allocating core memory buffers (code 22) at util2.c(106)

You can see, the first run without -H works, the last one with -H doesn't. 

So I would have to somewhat rename the bug report into "-H breaks the
incremental recursion on hard linked sources". This is as well true for all the
three file systems tested.

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